Add share file with link expiration

[onyx-and-iris]

Hi, this expands on #287 (I wasn't sure how to modify the existing PR...).

This PR includes the following:

• Snake case the expiredate kwarg to expire_date
• expiration added to ShareInfo object returned by {Client}.share_file_with_link
• test_share_with_link() has been expanded to include an expire_date.

When running the test suite TestPublicFolder.test_from_link kept failing with the error TypeError: can only concatenate str (not "int") to str due to line 401 so I added str(public_link_components.port).

This PR closes #287 and it closes #289.

Edit. I just noticed the last point is addressed by issue #291. So this PR overlaps and also closes #290 and closes #291.

[onyx-and-iris]

On the final point, TypeError raised in {Client}.from_public_link(), I can see this was previously fixed in commit b0c02b7 but then reintroduced in 299a72c. So I suppose ":" + str(public_link_components.port) avoids the use of an f-string and prevents the TypeError.